The present invention relates to microwave oven with a tray capable of making linear reciprocating movement. It includes hexahedral heating chamber for heating food, in the interior of heating chamber a tray whose undersurface is equipped with a long groove according to forward and backward direction is set, a motor is placed in the bottom portion of heating chamber, the rotating shaft of the motor is connected with a rotating component, on the eccentric position on the upper surface of the rotating component an is set eccentric projection which can be inserted into the groove, said microwave oven also includes rolling shaft component formed from several rollers and supporting portion, and the centre position of supporting portion is equipped with guide hole, and said supporting portion is made of metal material capable of reflecting microwave. Said invention can uniformly heat food. |